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fractint Digest       Wednesday, August 20 1997       Volume 01 : Number 005



In this issue:

    (fractint) Fractint File formats
    Re: (fractint) question for developers
    (fractint) Short absence
    Re: (fractint) Truecolor question
    (fractint) Re: Fractint tutorials
    (fractint) finally got around to saving some par files :^)
    Re: (fractint) finally got around to saving some par files :^)
    Re: (fractint) finally got around to saving some par files :^)
    (fractint) Re:
    (fractint) Tru.c workings
    (fractint) Fractint GIF format (binary)
    (fractint) GIF file format site
    Re: (fractint) good general book?
    (fractint) Hello
    (fractint) Hello again
    (fractint) Question
    Re: (fractint) Question
    Re: (fractint) Question
    (fractint) Question
    Re: (fractint) Question
    Re: (fractint) Question
    Re: (fractint) Question
    (fractint) Hello
    Re: (fractint) Question
    Re: (fractint) Question

See the end of the digest for information on subscribing to the fractint
or fractint-digest mailing lists and on how to retrieve back issues.

----------------------------------------------------------------------

Date: Fri, 15 Aug 1997 18:54:13 -0600
From: "Tim Wegner" <[e-mail]>
Subject: (fractint) Fractint File formats

Rich,

Re different Fractint formats for IFS, Lsystems, PAR

The reason for the split is that the original IFS and Lsystem files
came first, amd the parameter idea came later.

Feel free to propose a syntax for embedding Lsystems and IFS into PAR
files. But you'll have to make a case for it, and show that there's
an advaqntage. The current lsystems and IFS formats make
interoperability easy with other programs. For example, fdesign can
read and write Fractint IFS files. The lsystem format is pretty
standard, we've just wrapped curly brackets around it.

Tim


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Date: Fri, 15 Aug 1997 18:54:13 -0600
From: "Tim Wegner" <[e-mail]>
Subject: Re: (fractint) question for developers

 Noel mused:

>     I have some concern for existing features like colour cycling
> and palette editing, if true-colour displays are adopted.

Color cycling is a hardware feature of super VGA boards in 256-color
modes. It necessarily won't work in truecolor. When Fractint adds
truecolor capabilities, color cycling will still work in 256 color
modes.

> Won't Fractint
> have to switch graphics modes to utilize both truecolour and palette
> editing?

Not necessarily. One of the first truecolor algorithms we implement
will be one that continuously interpolates colors between the
escape-time bands. A 256-color palette editor will still be useful
for designing the colors of such an image.

But basically you are right. Truecolor demands a whole different
approach to coloring fractals. If truecolor is calculated "on the
fly" you won't be able to recolor fractals as a post-process, at
least not in the same way. On the other hand, Fractint could
simultaneously store the iteration and orbit information in a file,
and special post-processing could construct colors using different
algorithms, includoing use of a super-long palette.


> Isn't this rather a problem in the windows 3.1 and win95
> environment.

You won't be able to color cycle if Windows is in a truecolor mode.
Bert Tyler did get color cycling to work with the now-very-old
Winfract port, but under a 256-color video mode.


> Does this mean that Fractint will
> primarily remain a dos program or at least non-windows?

It means that if you want color cycling, you will have to use a
256-color video driver for windows. In the long run, my opinion is
that color cycling will be less and less important as truecolor
hardware and software become dominant.

Fractint can't stay as a DOS program and progress. At the very least,
fractint needs porting to a DOS extender environment such as the
djgpp compiler.

Tim


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Date: Fri, 15 Aug 1997 18:54:13 -0600
From: "Tim Wegner" <[e-mail]>
Subject: (fractint) Short absence

I'll be gone from Saturday morning (August 16) through Wednesday
(August 20). List traffic can continue as normal, but I won't be
available to handle any special fractint list problems until I get
back.

Tim
Fractint list owner

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------------------------------

Date: Fri, 15 Aug 1997 18:54:13 -0600
From: "Tim Wegner" <[e-mail]>
Subject: Re: (fractint) Truecolor question

Jason,

>     I'm trying to decipher just what's going on in that little bonus program
> called TRU.C which comes with Fractint.

I don't have time to answer this now, as I'm leaving for a few days
on a trip. I would like to say I'd love to see people play with
tru.c, because we're ovrdue for a truecolor implementation push. If
no one else can answer, please remind me after I get back next
Thursday.

Tim


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------------------------------

Date: Sat, 16 Aug 1997 13:16:43 -0400
From: Les St Clair <[e-mail]>
Subject: (fractint) Re: Fractint tutorials

Hi Peter,

>>I've been playing with Fractint for a while now, having a lot of fun
with it, but I feel as if I don't understand what I'm doing very deeply. =
I
know the book that originally was written to accompany the program is lon=
g
gone out of print because I've been searching for it. Is there a good
general tutorial on the program out there?<<

Don't forget the excellent documentation that comes with the latest relea=
se
(v19.6) of Fractint.

To get the full, 200+ page, Fractint.doc you need to execute the command
<Fractint Makedoc>

Once  you have expanded this documet you will find most of what you need =
to
know on how to use the program, as well as detailed explanation of all th=
e
fractal types supported plus history and background on fractals in genera=
l!
(page 138, I think<g>).

Bradley Beacham's "Formula Parser Tutorial" is now also included with
Fractint (you'll need to unzip it). Primarily designed to  introduce user=
s
to the wonders of formula writing, it also contains an introduction to
complex numbers plus a walkthrough of how the mandelbrot set is generated=
=2E

[apologies, of course, if you already knew this!]

- - Les

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------------------------------

Date: Sat, 16 Aug 1997 20:07:10 -0400 (EDT)
From: "Melissa D. Binde" <[e-mail]>
Subject: (fractint) finally got around to saving some par files :^)

These are all fractals I've created in the last month or so.  Unfortunately
they're not available online yet, but I'll have them up by the middle of
September.  Until then, here are a few.  They are all fractals which I've
put into my "odd fractals" category.


Eaves              { ; Melissa Binde ([e-mail])
  reset=1960 type=fn+fn function=tan/asin
  center-mag=-0.042885/-0.0626068/0.00999991/0.6001 params=3/0/-1/2
  bailoutest=imag inside=startrail
  colors=000PXQ<3>6Q6b`b<13>QMEbbc<15>rxXWVc<3>22g`Xg<3>S9wbaa<14>Rl0b`b<1\
  5>j7Nbab<17>se6`_b<15>21Ibab<21>duHa`c<17>I6kmLSx4FbZb<4>bGUbCSdYa<5>v4O\
  b`c<21>t6scbe<5>jjvbac<18>QRpmmZyyUfLhj3mbac<17>tdWaW_<6>dM_
  }

Modern Art I       { ; Melissa Binde ([e-mail])
  reset=1960 type=fn*z+z function=recip
  center-mag=-0.133608/-0.30777/0.07022472 params=1/0/1/0
  maxiter=10000 outside=imag
  colors=000000<30>zKU<30>211000000<14>000010030<29>0z0<30>020000000<14>00\
  0110330<29>zz0<30>220000000<29>000
  }

Modern Art II      { ; Melissa Binde ([e-mail])
  reset=1960 type=mandel(fn||fn) function=abs/floor
  center-mag=+0.06542968500000002/+0.00207519499999997/0.3335641/0.9996
  params=0/0/0.5 maxiter=1000 outside=atan
  colors=000VHWC9hdaP<3>pt`dUXfQghLsZuubPKbGIa6GZUJ<4>D72UcR<2>2uhQ_LDaKZU\
  J<4>CA4ZYM<6>1bGa_K<4>XjA`UL<6>G1DcXQ<6>pPwWWI<3>1M0dZT<2>lcmYYT<2>I`pGB\
  qaYK<4>WWANPU7Gb_YR<4>GbpgPSmGZY_M<5>0lH_WQ<5>FFpZXQ<5>6PqttGeVL<2>nLHcW\
  M<6>mIJZUJVQGRLDcVL<6>n3CcRW<2>f6zUVL<2>0MHRPOFFQ35SZXM<4>AQJXdaRkq_ZI<3\
  >Le0bZJ<5>ge1cYVdZce_lb`N<6>_wWXbM<3>7yMaZV<2>ZbvbRUcJbdBklSPvMSXYM<3>8a\
  NfSM<3>z3IcUR<5>i0wZ`O<3>HpZRYCEY1SdZGkk4rx_PJXGGT7DeYR<4>u`qYZP<5>0gkZ`\
  L<3>InFebK<3>txCWODOD35GZ<5>OlB
  }

Attraction         { ; Melissa Binde ([e-mail])
  reset=1960 type=fn*z+z function=sin
  center-mag=10.2981/0.103254/21.26705 params=1/0/1/0 maxiter=10000
  inside=startrail
  colors=0007D7<2>EQF0AK<2>1Qooyz202<18>f5q120<17>Ro6124<7>FIf121<16>KmP64\
  4<8>xlc111<21>Rde888<3>cdc111<22>RRP443<11>sqiIM2_g5215<8>KHm211<22>yUR1\
  33<5>7RQ033<14>8nm133<15>TpoBIEM_TYrg022<21>Gwu242919485
  }

Untitled I         { ; Melissa Binde ([e-mail])
  reset=1960 type=barnsleyj1
  center-mag=-7.81415e-005/2.831e-006/2.722332
  params=-0.02250748872756958/1.029216051101685 bailoutest=manr
  colors=00000U60Z<56>wzzF9g<98>00AO9n<46>mJnM8n<34>J8fM8nJ8f<9>I7d
  }

Pierce             { ; Melissa Binde ([e-mail])
  reset=1960 type=manfn+zsqrd function=exp
  center-mag=-1.01564455569461800/-0.00000000000000078/2.73224
  params=0/0 float=y maxiter=5000 bailoutest=imag outside=atan
  colors=000OQ_<52>wwwILY<64>OJzJKY<7>S5QILY<47>TCqILY<56>bbeILY<5>IMWIMWI\
  LYIMW<8>JNT
  }

Sunset I           { ; Melissa Binde ([e-mail])
  reset=1960 type=manzzpwr
  center-mag=-0.09039579154635699/-0.00119081522699212/17.72227
  params=0/0/1.98 float=y maxiter=5000 bailoutest=imag outside=mult
  colors=000NAA<8>GEJFFKGFJ<3>LEFMEEODDPCC<22>x11z00z10<29>zx0zz0zz1<29>zz\
  xzzzzzz<61>zV1zU0zU0zT0<28>z10z00z00y00<30>c00b11a11`22_22<14>OAA
  }

Sunset II          { ; Melissa Binde ([e-mail])
  reset=1960 type=mandel(fn||fn) function=sin/ident
  center-mag=+0.05046081500000010/+0.00207519499999997/0.3335641/0.9996
  params=0/0/0.5 outside=imag
  colors=00K00K00PGWBNfPnoUnUUncKncUccUccAcUAUK0X5ZX5aX5dY6g<6>U1tT1vT2v<6\
  >WAywnQT9v<3>TDswnQTFr<3>TKpwnQTMo<4>USmwnQUUl<5>U`iwmA<35>xr6xs6xs5xt5x\
  t5<10>zz0zz0zz0zz0zz0<27>zz0bPb<8>UobNzc<9>Uqb`_B<36>Uqbwcp<27>Vqbk8f<7>\
  WlbEUv<2>Qkgu7_<9>hTa
  }


- --
Melissa Binde  --  [e-mail]
Outside the Asylum  --  http://www.terindell.com/
Babylon 5 Weekly Column -- http://babylon5.miningco.com
- ------------------------------------------------------------------------------
It was a high counsel that I once heard given to a young person, "Always
do what you are afraid to do."                    -- Ralph Waldo Emerson


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------------------------------

Date: Sun, 17 Aug 1997 20:12:10 -0400
From: [e-mail] (Francois Blais)
Subject: Re: (fractint) finally got around to saving some par files :^)

"Melissa D. Binde" <[e-mail]> wrote:

>Modern Art II      { ; Melissa Binde ([e-mail])
>  reset=1960 type=mandel(fn||fn) function=abs/floor
>  center-mag=+0.06542968500000002/+0.00207519499999997/0.3335641/0.9996
>  params=0/0/0.5 maxiter=1000 outside=atan
>  colors=000VHWC9hdaP<3>pt`dUXfQghLsZuubPKbGIa6GZUJ<4>D72UcR<2>2uhQ_LDaKZU\
>  J<4>CA4ZYM<6>1bGa_K<4>XjA`UL<6>G1DcXQ<6>pPwWWI<3>1M0dZT<2>lcmYYT<2>I`pGB\
>  qaYK<4>WWANPU7Gb_YR<4>GbpgPSmGZY_M<5>0lH_WQ<5>FFpZXQ<5>6PqttGeVL<2>nLHcW\
>  M<6>mIJZUJVQGRLDcVL<6>n3CcRW<2>f6zUVL<2>0MHRPOFFQ35SZXM<4>AQJXdaRkq_ZI<3\
>  >Le0bZJ<5>ge1cYVdZce_lb`N<6>_wWXbM<3>7yMaZV<2>ZbvbRUcJbdBklSPvMSXYM<3>8a\
>  NfSM<3>z3IcUR<5>i0wZ`O<3>HpZRYCEY1SdZGkk4rx_PJXGGT7DeYR<4>u`qYZP<5>0gkZ`\
>  L<3>InFebK<3>txCWODOD35GZ<5>OlB
>  }

 I find this one very interesting.
 In particular the fact that it's based on a Fractint 'bug'.
 If you set floating point to yes, you'll see the difference.
 I also found another interesting variation with both fp enabled and
 the outside color set to atan.
 Thanks for the par!

- --
                           La voix de ma contrebasse
                             Quebec City * Canada
        "Research is what I'm doing when I don't know what I'm doing."

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------------------------------

Date: Sun, 17 Aug 1997 22:30:58 -0400 (EDT)
From: "Melissa D. Binde" <[e-mail]>
Subject: Re: (fractint) finally got around to saving some par files :^)

On Sun, 17 Aug 1997, Francois Blais wrote:

> "Melissa D. Binde" <[e-mail]> wrote:
>
> >Modern Art II      { ; Melissa Binde ([e-mail])
>
>  I find this one very interesting.
>  In particular the fact that it's based on a Fractint 'bug'.
>  If you set floating point to yes, you'll see the difference.
>  I also found another interesting variation with both fp enabled and
>  the outside color set to atan.
>  Thanks for the par!

Yes, lots of them have "cousins" which I have squirreled away on my hard
drive :^).  I liked this version best though.

- --
Melissa Binde  --  [e-mail]
Outside the Asylum  --  http://www.terindell.com/
Babylon 5 Weekly Column -- http://babylon5.miningco.com
- ------------------------------------------------------------------------------
The system runs with NT 3.51, service pack 5. At now, we have no idea why.
        -- out of context; from a mailing list


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------------------------------

Date: Mon, 18 Aug 1997 11:19:37 -0700
From: Kenny McAlpine <[e-mail]>
Subject: (fractint) Re:

> What is a good general book on fractals, something somehere between pop > science and a rigorous mathematical treatment?
>
A good one is Peitgen, Jurgens and Saupe's 'Fractals for the Classroom'
parts 1 & 2, pub. Springer-Verlag. It's aimed at American Schoolkids,
and can be approached either as a rigorous treatment, or as a nice easy
introduction. Highly recommended.

Kenny

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Date: Mon, 18 Aug 1997 08:20:48 -0600 (MDT)
From: Jason Hine <[e-mail]>
Subject: (fractint) Tru.c workings

Howdy all,
    After a weekend of playing around with the little piece of C code that
comes with Fractint called TRU.C, I've determined the following (maybe!):

    1) TRU.C is designed to read in the file ITERATES.TGA produced when
Fractint is given the "truecolor=yes" command;  TRU.C first reads in the file
header (see next note!), then reads in the actual iterations data.  There is a
subroutine, RGBMAP, which produces a new .TGA file containing color data instead
of iterations data.

    2) There seems to be a problem reading in the header which looks like
this:
    Who-knows-what... 12 bytes
    xdots............  2 bytes
    ydots............  2 bytes
    Who-knows-what...  2 bytes
    Max_iteration....  4 bytes

    All these values are being read correctly except for ydots, which always
ends up being a large number, like 6147489 or such...

    3) If you set a viewwindow size of 50x38 and create iterates.tga, then
not only is the ydots in the header corrupt, but the actual iteration data is
also incorrect.

    Can someone provide me with the supposed binary file format for the
iterates.tga file?  Other suggestions welcome... I have another question, but
I'll post it in a separate email.  Thanks, all!

                    Jason (Iteration) Hine

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Date: Mon, 18 Aug 1997 08:33:40 -0600 (MDT)
From: Jason Hine <[e-mail]>
Subject: (fractint) Fractint GIF format (binary)

Howdy again,

    As some of you may recall, I'm working on an add-on for Fractint that
will allow unmanned zooming... my apologies, please!  I mean _unpersoned_
zooming...  There is a program out there called Fractal eXtreme which has such a
feature, and that program is available for a free trial period (anyone have a
URL for that site?)  Anyway, I'm debating whether to write my program to work
with GIF files or the .TGA file created when you give Fractint the
"truecolor=yes" command.

    The .TGA file would be the easiest to work with, since what I'm really
interested in is the iterations value for each pixel, and that's exactly what's
in ITERATES.TGA.  On the other hand, it seems that the state of Fractint's
truecolor support scene is, if not currently, then soon to be undergoing some
modifications, whereas the GIF file format seems pretty well established.  Also,
there may be some problems with Fractint's ability to write ITERATES.TGA for
viewwindowed images.

    Going with the GIF file, on the other hand, would be a pain... mostly
because a) there's the LZW compression to deal with, and b) I'm just a novice
programmer, and not even any kind of /graphics/ programmer!  Choosing to work
with GIFs will complicate things programming-wise, but is more likely to mean
that my program will still work fine with future versions of Fractint.

    I'm hoping that Tim will be able to help me come to a decision when he
returns... in the meantime, any ideas from the peanut gallery would be most
welcome!

                Jason (the Peanut) Hine

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------------------------------

Date: Mon, 18 Aug 1997 09:35:36 -0600 (MDT)
From: Jason Hine <[e-mail]>
Subject: (fractint) GIF file format site

All,
    I've located a source for GIF and other file format definitons:

    http://wwwhost.ots.utexas.edu/mac/pub-mac-graphics.html

                    Jason (FYI) Hine

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Date: Mon, 18 Aug 1997 13:18:33 -0700
From: "Jay Hill"<[e-mail]>
Subject: Re: (fractint) good general book?

pfj wrote:
Hi. I've been playing with Fractint for a while now, having a lot of fun
with it,
but I feel as if I don't understand what I'm doing very deeply. I know the
book that originally was written to accompany the program is long gone
out of print because I've been searching for it. Is there a good general
tutorial on the program out there? And what is a good general book on
fractals, something somehere between pop science and a rigorous
mathematical treatment?



Now some have said the Fractint books are out of print.  Does anyone
out there (I hate it when they say that, like you all are homeless in the
cold)
want a copy? These show up at  close out stores sometimes.   A friend
of mine saw some, so I'm a huntin'.

Let me know if you are interested.


Jay
http://www.geocities.com/CapeCanaveral/Lab/3825
main(){int f,g,h=0;float a,b,c,d,e;for(;h<3920;putchar("^^/-,;<:lnb/bh`\
r/ylqbAmmhI/S/x`K\013"[++h>3840&&g<25?31-g:g>79?31:f]^^1))if(!(f=(8*(c=(
d=(g=1+h%80)/31.-2)*d+(e=.047*(h/80-24))*e)-3)*c+d<3/32.?24:16*(1+2*d+c
)<1?30:0))for(a=d,b=c=0;(b=2*b*c+e)*b+(c=a)*a<=4&&++f<26;a=d-b*b+c*c);}



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Date: Tue, 19 Aug 1997 15:17:33 -0400
From: "Damien M. Jones" <[e-mail]>
Subject: (fractint) Hello

Howdy folks...

Finally found my way over to this list, now that I got xmission.com to lift
the ban on address at emi.net.  But it doesn't seem to be generating any
mail.  Hmmm.

Anyway, looking forward to FractInt-specific discussions.  Has anyone
figured out how to get FractInt to use new coloring techniques, without
resorting to changing the source code?

Damien M. Jones  /  temporary sanity designs  /  http://www.emi.net/~dmj/
   [e-mail]  /  my gallery: http://www.geocities.com/SoHo/Lofts/2605/


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Date: Tue, 19 Aug 1997 17:40:56 -0400
From: "Damien M. Jones" <[e-mail]>
Subject: (fractint) Hello again

Hello...

After downloading the archive of previous messages (200K!) I see that
people have been introducing themselves a bit as they join.  So perhaps I
should do that...

My first introduction to fractals was in junior high school, in the
mid-80s.  (Yes, that *does* indicate I'm still a young whipper-snapper.
Age is the gift that everyone eventually gets.)  I was hooked right away,
but it was a few years before I could start messing around on my own, with
an Atari ST computer.  Three or so years ago I found FractInt (DOS), and my
skill with this program continues to improve.  (Not necessarily my artistic
ability--just my skill with the program. :)

Recently I took over management of the Infinite Fractal Loop, a web ring
dedicated to fractal art.  Its home page is http://www.emi.net/~dmj/ifl/
for those who wish to browse through it.

Damien M. Jones  /  temporary sanity designs  /  http://www.emi.net/~dmj/
   [e-mail]  /  my gallery: http://www.geocities.com/SoHo/Lofts/2605/


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Date: Tue, 19 Aug 1997 18:07:59 -0400 (EDT)
From: A M Kelley <[e-mail]>
Subject: (fractint) Question

- --1920402471-458474435-872028846:#6557
Content-Type: TEXT/PLAIN; charset=US-ASCII

The newbie is here with a question. I have had fractals that have a hole
in the middle of their spiral that simply refuses to fill in. Attached is
an example; the swirl on the left has a filled in hole and the swirl on
the right has a blank hole. (Can you stand all this technical jargon?<G>)
It doesn't seem to have anything to do with the maxiter. One of my very
favorite fractals has one of these holes and I'm tempted to do away with
it using Paintshop.<G> If anyone would like to explain these holes,
please, no equations.<VBG>--Alice

- --1920402471-458474435-872028846:#6557
Content-Type: APPLICATION/octet-stream; name="question.par"
Content-ID: <Pine.3.07.9708191806.A6557@login>
Content-Description:

Question_fractal   { ; [e-mail]
  reset=1960 type=lambdafn function=ident passes=2
  center-mag=-0.345098/0/0.3333333 params=1/0.4 float=y maxiter=2000
  invert=1/0.5/0 decomp=256 viewwindows=2/0.75/yes/0/0
  colors=iYViYV<25>763552663<29>iloknqjmp<29>773551551<30>WV7WV7VU7<28>662\
  551662<30>xn_<30>773551662<29>m_XoaZn`Yl_XkZW
  }


- --1920402471-458474435-872028846:#6557--


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Date: Tue, 19 Aug 1997 19:28:35 -0400 (EDT)
From: Jim Muth <[e-mail]>
Subject: Re: (fractint) Question

- --=====================_872043905==_
Content-Type: text/plain; charset="us-ascii"


At 06:07 PM 8/19/97 -0400, you wrote:

>The newbie is here with a question. I have had fractals that have a hole
>in the middle of their spiral that simply refuses to fill in. Attached is
>an example; the swirl on the left has a filled in hole and the swirl on
>the right has a blank hole. (Can you stand all this technical jargon?<G>)
>It doesn't seem to have anything to do with the maxiter. One of my very
>favorite fractals has one of these holes and I'm tempted to do away with
>it using Paintshop.<G> If anyone would like to explain these holes,
>please, no equations.<VBG>--Alice


Alice:

The hole in your otherwise fine fractal is caused by a combination of
things.  First, the bailout is too low -- I set it to 5000.  Second, the
periodicity should be disabled with this fractal -- I set it to 0.  Third,
the maxiter need be nowhere as high as you had set it -- I set it to 255.
Fourth, the Log Palette should be turned on, which I did.  The result is
visible in the par file named answer.par, which I have attached.  I think
this is the effect you were after.

Hope I was of help, and good luck with those fractals.


Jim Muth
[e-mail]


- --=====================_872043905==_
Content-Type: text/plain; charset="us-ascii"
Content-Disposition: attachment; filename="ANSWER.PAR"

                   {
  reset=1960 type=lambdafn function=ident
  center-mag=-0.34509800000000010/+0.00000000000000000/0.3333333
  params=1/0.4 float=y maxiter=255 bailout=5000 logmap=yes
  invert=1/0.5/0 decomp=256 periodicity=0
  colors=000iYV<25>763552663<29>iloknqjmp<29>773551551<30>WV7WV7VU7<26>882\
  772662551662873<29>xn_<31>551<30>m_XoaZn`Yl_XkZW
  }


- --=====================_872043905==_--


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Date: Tue, 19 Aug 1997 19:29:04 -0400
From: "Damien M. Jones" <[e-mail]>
Subject: Re: (fractint) Question

Alice,

This one's easy.  Increase your bailout (z options page) to about 1,000,000
or so.  It'll go away.

Damien M. Jones  /  temporary sanity designs  /  http://www.emi.net/~dmj/
   [e-mail]  /  my gallery: http://www.geocities.com/SoHo/Lofts/2605/


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Date: Tue, 19 Aug 1997 19:34:44 -0400
From: Sylvie Gallet <[e-mail]>
Subject: (fractint) Question

Hi Alice,

>> The newbie is here with a question. I have had fractals that have a ho=
le
>> in the middle of their spiral that simply refuses to fill in. Attached=

is
>> an example; the swirl on the left has a filled in hole and the swirl o=
n
>> the right has a blank hole.

  The center of the spiral on the right is also the center of the inversi=
on
(0.5,0).  The inversion transforms each pixel close to (0.5,0) to a very
big number and the orbit escapes at the first iteration.

>> It doesn't seem to have anything to do with the maxiter.

  No but the blank hole disappears if you set the bailout value to 10000.=


>> please, no equations.<VBG>

  It was not necessary <G>!

        -  Sylvie

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Date: Tue, 19 Aug 1997 16:52:39 -0700
From: "Jay Hill"<[e-mail]>
Subject: Re: (fractint) Question

Fine on terh left side bu-bu-bu--buu-but on the right side the

HoleIsStillThere     { ; Jay Hill
  reset=1960 type=lambdafn function=ident
  center-mag=+0.50184024821583820/-0.00000000000000019/34.24057
  params=1/0.4 float=y maxiter=255 bailout=5000 logmap=yes
  invert=1/0.5/0 decomp=256 periodicity=0 viewwindows=2/0.75/yes/0/0
  colors=000iYV<25>763552663<29>iloknqjmp<29>773551551<30>WV7WV7VU7<28>662\
  551662<30>xn_<31>551<30>m_XoaZn`Yl_XkZW
  }

whoever smaller with 4 'corner'.


Jay



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Date: Wed, 20 Aug 1997 00:58:39 -0400 (EDT)
From: Donald Archer <[e-mail]>
Subject: Re: (fractint) Question

Alice:

>The newbie is here with a question. I have had fractals that have a hole
>in the middle of their spiral that simply refuses to fill in. Attached is
>an example; the swirl on the left has a filled in hole and the swirl on
>the right has a blank hole. (Can you stand all this technical jargon?<G>)
>It doesn't seem to have anything to do with the maxiter. One of my very
>favorite fractals has one of these holes and I'm tempted to do away with
>it using Paintshop.<G> If anyone would like to explain these holes,
>please, no equations.<VBG>--Alice
>Content-Type: APPLICATION/octet-stream; name="question.par"
>Content-ID: <Pine.3.07.9708191806.A6557@login>
>Content-Description:
>
>Attachment Converted: C:\ARCHDOR\question.par

I don't know what to tell you. It's a hole alright, no matter how
you look at it. I don't normally use the options that you invoked,
but I suspect you've pushed the Fractint code a little beyond the margin
for this fractal type. I suggest you ask Tim Wegner, Fractint developer and
administrator here. I'd be interested in his response. Nice image, too.

Don


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Date: Wed, 20 Aug 1997 04:19:01 -0400 (EDT)
From: [e-mail]
Subject: Re: (fractint) Question

In a message dated 97-08-20 04:14:09 EDT, you write:

<< Alice:

 >The newbie is here with a question. I have had fractals that have a hole
 >in the middle of their spiral that simply refuses to fill in. Attached is
 >an example; the swirl on the left has a filled in hole and the swirl on
 >the right has a blank hole. (Can you stand all this technical jargon?<G>)
 >It doesn't seem to have anything to do with the maxiter. One of my very
 >favorite fractals has one of these holes and I'm tempted to do away with
 >it using Paintshop.<G> If anyone would like to explain these holes,
 >please, no equations.<VBG>--Alice
 >Content-Type: APPLICATION/octet-stream; name="question.par"
 >Content-ID: <Pine.3.07.9708191806.A6557@login>
 >Content-Description:
 >
 >Attachment Converted: C:\ARCHDOR\question.par

 I don't know what to tell you. It's a hole alright, no matter how
 you look at it. I don't normally use the options that you invoked,
 but I suspect you've pushed the Fractint code a little beyond the margin
 for this fractal type. I suggest you ask Tim Wegner, Fractint developer and
 administrator here. I'd be interested in his response. Nice image, too.

 Don

  >>
If you are doing iterative Julia/Mandelbrot set fractals, the black hole in
the center is representative of the area of the graph where a greater number
of iterations are necessary for the function to exceed the "blowup"
parameter...if you increase the number of iterations to 256, 512, 768, 1024
and so on, more of the graph will fill in...
ultimately though, the graph will never quite be completely "filled in"...

Hope that helps,

Jeff

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Date: Wed, 20 Aug 1997 09:48:17 -0400
From: lelio <[e-mail]>
Subject: (fractint) Hello

 Hello everyone, I am a new user (6 months) of Fractint.  I love it.  I just
found the mailing list so this is cool too.
However when I was cutting and pasting for various .par and .frm files,
Fractint didn't like it, I think it put in control characters in the
clipboard, I don't know, I have had to re-type them and that's OK, the
images have been, for the most part, really cool.

Here is my request, could you (being all who post formulas or parameters)
post them as e-mail attachments?  A few have done this and it makes it so
much easier.

Like I said I'm still new to the software, but I'm learning, I'll post some
.par files soon.  :)

Thanks,
Russel

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Date: Wed, 20 Aug 1997 10:18:45 -0400 (EDT)
From: A M Kelley <[e-mail]>
Subject: Re: (fractint) Question

Thank you to all who answered my question! I'm so glad this was easy.<G> I
still have to go look at the pars that were sent to me. Jim, when I turned
the log palette on, I hit 2 so it would choose its own setting, and it
picked 33, which looked very bad. The log palette always acts that way for
me. Sometimes I can improve an image by setting it to 1 or -1, but very
rarely does setting it to 2 (the auto setting) do any good. I mean, 33??
  I am not totally sure why having a maxiter that's too high is bad.
  And the periodicity setting....Les St. Clair has tried to explain that
to me, and it's like a big brick wall.<G> I never think to try altering
that setting because it's so meaningless to me, and I have no way of
realizing what kind of fractal might respond to a change in that value.
I'll have to try it on all my fractals.<G>--Alice



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Date: Wed, 20 Aug 1997 10:45:03 -0600 (MDT)
From: <[e-mail]>
Subject: Re: (fractint) Question

On Wednesday, August 20, 1997 10:18:45 you wrote:


>the log palette on, I hit 2 so it would choose its own setting, and it
>picked 33, which looked very bad. The log palette always acts that way for
>me. Sometimes I can improve an image by setting it to 1 or -1, but very
>rarely does setting it to 2 (the auto setting) do any good. I mean, 33??
>  I am not totally sure why having a maxiter that's too high is bad.

Hi Alice,

  In the simples case with logpallete = -1 or 1 the colours get spread out across
the whole range of iterations possible, from 1 ... maxiter. This means that, if you're
looking at a zoomed fractal, some of the 256 available colour bands are in effect outside
your screen, not displayed and therefore wasted. In extreme cases this would mean only
showing a just few colours when you could have 256.. not necessarily a bad thing but often
resulting in a picture with little detail. To counter this you can give logpalette a value
(say 33 ) which results in the colour bands being spread across iteration values
33 ... maxiter.
  What autolog does is do the calculations for all the pixels round the edge of your zoomed
view first, find out the lowest value it encountered and then use this as the lower end of
the colour spread used by logmap. This only gives good results if the fractal is one which
has no 'islands' of lower iterations inside such as the Mset.
Though this is the most 'efficient' way of using colours it also results in the colourmap
being shifted so you might need to cycle things a bit to get back to the look you had
before.


Hope this helps,
              Robin.



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